zxhn_z500_firmware: Inclusion of Functionality from Untrusted Control Sphere
CVE-2024-45416 is a high-severity inclusion of functionality from untrusted control sphere vulnerability in zxhn_z500_firmware from ZTE, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected zxhn_z500_firmware versions: V1.0.1.1B2.1000. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.56% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of zxhn_z500_firmware you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| ZTE | zxhn_z500_firmware | V1.0.1.1B2.1000 | Not stated |
| ZTE | zxhn_e500_firmware | V1.0.1.1B2.1000 | Not stated |
| ZTE | zxhn_h108n_firmware | V2.6.20.ROST12 | Not stated |
| ZTE | zxhn_e2615_firmware | V1.0.1 | Not stated |
| ZTE | zxhn_e2603_firmware | V1.0.1 | Not stated |
| ZTE | zxhn_e2618_firmware | V1.0.0.2B4.3000 | Not stated |
| ZTE | zxhn_e1600_firmware | V1.0.0.2B1.1000 | Not stated |
| ZTE | zxhn_h338a_firmware | V1.5.0_H3A.1T9P1-o | Not stated |
| ZTE | zxhn_h168n_firmware | V3.5.5_CO.1T1 | Not stated |
| ZTE | zxhn_h168a_firmware | TTN.1T1_211029 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
The HTTPD binary in multiple ZTE routers has a local file inclusion vulnerability in session_init function. The session -LUA- files are stored in the directory /var/lua_session, the function iterates on all files in this directory and executes them using the function dofile without any validation if it is a valid session file or not. An attacker who is able to write a malicious file in the sessions directory can get RCE as root.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Inclusion of Functionality from Untrusted Control Sphere
The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.
How developers prevent this class of flaw
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs. For example, ID 1 could map to inbox.txt and ID 2 could map to profile.txt. Features such as the ESAPI AccessReferenceMap provide this capability.
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
More Inclusion of Functionality from Untrusted Control Sphere vulnerabilities (CWE-829)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in zxhn_z500_firmware
- 9.8 Critical severity
- 9.8 Critical severity
- 8.1 High severity
Recent Inclusion of Functionality from Untrusted Control Sphere vulnerabilities
- 8.0 High severity
- 8.8 High severity
- 8.1 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
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